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Bulletproof glass is composed of glass (or organic glass) a composite material and quality engineering plastic with a special processed, it is usually transparent materials, such as PVB/ polycarbonate thermoplastic plastics (general force explicit resin namely Lexan resin is also called LEXAN PC RESIN). The appearance and the transmitted light it with ordinary glassbehavior, for small arms fire to provide some protection. The PC thick plate can be 136 mm thick,maximum width up to 2166 mm wide, the effective time of 6664 days.Different manufacturers vary the bulletproof glass. But basically are in ordinary glass layerclamped polycarbonate material layer, a process called lamination. In this process, the formation of a similar to ordinary glass than ordinary glass thicker material. Polycarbonate is a hard transparent plastic -- people usually use it (Lexan brand, Tuffak or Cyrolon) to call it. Bullet proof glass with thickness of 7 mm to 75 mm. Shot in the bulletproof glass of bullets will penetrate the glass outer layer, but the polycarbonate glass material layer can absorb the bullet energy,thereby preventing it penetrates the glass. These chunks of bulletproof glass has been made useof in public during the second world war is usually thicker than 10 cm to 12 cm, and extremeweight.For example, some banks use bullet proof car to promote one-way bulletproof glass of the invention. Outside the small arms fire glass this glass will follow close on succession ofresistance, but will be allowed in the glass on the side (Li Ce) shooting, such as the defenderfrom the bullet proof car side in the shooting, which through the glass in the external threat onfire.
In bomb attacks and accidental explosion, direct harm anti bomb glass can minimize the explosive shock wave super high load and high speed flying glass fragmentation caused byreducing costs, repair facilities around attack facilities or the center of the explosion. Anti bombglass in the load increasing energy of explosion shock wave formation, increased severalfold even a few times to maintain conditions do not penetrate the glass, keep the value RET = 1.While the monolithic glass (including float glass, tempered glass, hollow glass) once broken, as long as exceeds the critical breakdown pressure RET soon fell to below 0.3, glass fragments scattered, the emergence of penetrating damage. 
The explosion-proof function
In the global scope, bomb attacks (including car bombs, suicide bombers) and threats continue to rise, Marriott Indonesia is a typical event, with the increase of the bombs, the people's life safety and property have been very serious threat. According to security experts and relevant data shows, glass fragments scattered and the spatter is the main reason people get hurt. In the bomb terrorist bombings, 75% damage and glass related, this means that if the use of anti bombglass can reduce the injury degree of 75%. If the explosion happened, all the buildings in theglass can be completely retained in the frame, then the shock wave energy will not enter indoor,indoor items will not damage; damage of high speed fragments can not enter the buildings ordropped to the ground.
The explosion of the rapid expansion of the shock and vibration is mainly caused by the damage of glass. Generated source fragments in weapon itself and the surrounding environment (such as shaking off buildings caused by debris), destructive effect to withstand bomb attacks, the firstglass must withstand the blast and fragmentation in the two aspects of the attack. Calculation of anti bomb glass and software through professional calculation of anti bomb glass frame system,can according to the glass retention, explosion shock pressure and shock wave pulse(kPa/msec), duration (MS msec), the extent of damage conditions were tested to calculate the bomb exploded when certain equivalent of the glass and the system can remain intact (glassunruptured) and rupture (cracks, there can be part of the debris fall off, has penetrated the).Anti should meet ASTM F1642-96 standard test requirements bomb glass.
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